In blame, avoid reading the blamed file one character at a time.
In blame, avoid reading the blamed file one character at a time.

* subversion/libsvn_client/blame.c (svn_client_blame3): Open the file in
  buffered mode for reading the final contents.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@859524 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion